A Draft Regional Guidebook for Applying the Hydrogeomorphic

Approach to Assessing Wetland Functions of Vernal Pool Depressional Wetlands in Southern California Ellen T. Bauder1, Andrew J. Bohonak1, Barry Hecht2, Marie A. Simovich3, David Shaw2, David G. Jenkins4, and Mark Rains5 1San Diego State University, 2Balance Hydrologics, 3University of San Diego, 4University of Central Florida, 5University of South Florida

December 2009 Updated November 8, 2011

ABSTRACT: This Draft Guidebook is an assessment tool that focuses on the functioning of

vernal pool wetlands within the Southern Californian eco-region, specifically San Diego County.

Its purpose is to provide trained practitioners the means to achieve efficient, reproducible and

logical functional assessment results for vernal pool wetlands in San Diego County, California.

Results of these assessments can then be used in a variety of ways, such as evaluation of sites for

restoration potential, assessment of impacts from existing or proposed projects and monitoring

restoration success. Due to the high degree of variability experienced by temporary wetlands in

arid climates, we have developed both direct and indirect functional indices for four of the five

functions we identified. Direct assessments can only be made when there is sufficient

precipitation to elicit the responses that demonstrate function, and we have sought to objectively

define "sufficient." Consistent with an HGM approach, use of this Draft Guidebook should be

confined to the geographic region and hydrogeomorphic class, subclass and pool types for which it

was developed. Use of this methodology outside the boundaries of the reference domain is wholly

inappropriate. We are hopeful that our approach can be modified for other pool types within the

region, and to vernal pools in other parts of California and Oregon.

Bauder, Ellen T., Andrew J. Bohonak, Barry Hecht, Marie A. Simovich, David Shaw, David G. Jenkins, and Mark Rains. 2009. A Draft Regional Guidebook for Applying the Hydrogeomorphic Approach to Assessing Wetland Functions of Vernal Pool Depressional Wetlands in Southern California. San Diego State University, San Diego, CA.

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